tests: Fix broken dwflsyms tests, extend test and add prelink tests.

tests: Fix broken dwflsyms tests, extend test and add prelink tests.

The two test files that contains minisymtab tables and the expected test
output were wrongly generated. Also prelink tests were missing to check
that a prelinked main ELF file with separate debug or minisyms generated
correctly adjusted symbol values. The dwflsyms test was also extended to
check print and check the result of dwfl_module_relocate_address.

Reported-by: Josh Stone <jistone@redhat.com>
Signed-off-by: Mark Wielaard <mjw@redhat.com>